Update notes for submitted changes

* PackWriter: support excluding objects already in other packs

a1/a8c6d77ec5bea13c4f5ca428e425d95e14e003

+Code-Review+2: Chris Aniszczyk <caniszczyk@gmail.com>
+IP-Clean+1: Chris Aniszczyk <caniszczyk@gmail.com>
+Verified+1: Chris Aniszczyk <caniszczyk@gmail.com>
+Verified+1: Hudson CI
+Submitted-by: Chris Aniszczyk <caniszczyk@gmail.com>
+Submitted-at: Sun, 21 Aug 2011 17:03:56 -0400
+Reviewed-on: http://egit.eclipse.org/r/3997
+Project: jgit
+Branch: refs/heads/master